Cannot execute the specified command
What happened
The button, hotspot,
or toolbar tool you clicked executes an @command or other
action in a mode that does not support that action. This message
appears, for example, if you click a tool that does not apply to the current
view or that references an unsupported function, such as an unavailable Help
file.
What you can do
Make sure that the action you try is appropriate for the current context. If the window has frames, try clicking a different frame.